On Monday, observers of the skies will once again have the opportunity to experience a rare "black moon." There was already a black moon on December ... new moon in a calendar month.

This phenomenon, defined as the second new moon in a single calendar month ... sunrise limits visibility. The black moon reaches its peak on December 30, 2024, at 5:27 p.m. ET (22:27 GMT).

The company says that as of 2024, it began listing only public holidays and national observances, not cultural and historical ...

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This phenomenon will mark the second time a new moon appears in a single calendar month, which is a rare occurrence; it does not happen every year. The Black Moon will occur on December 30 ...